// Copyright © 2021 The Things Network Foundation, The Things Industries B.V.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package cleanup

// ComputeSetComplement returns the complement of the first parameter set relative to the second parameter set.
func ComputeSetComplement(isSet, localSet map[string]struct{}) (complement map[string]struct{}) {
	complement = make(map[string]struct{})
	for ids := range localSet {
		if _, ok := isSet[ids]; ok {
			continue
		}
		complement[ids] = struct{}{}
	}
	return complement
}
